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  4. For a first order reaction, the half-life is text10 textmins text. How much time in minutes will it take to reduce the concentration of reactant to 25 % of its original concentration?

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Q. For a first order reaction, the half-life is $\text{10} \, \text{mins} \text{.}$ How much time in minutes will it take to reduce the concentration of reactant to $25\%$ of its original concentration?

NTA AbhyasNTA Abhyas 2022

Solution:

It takes two half-lives to reduce the concentration of reactant to $25\%$ of its original concentration. Solution
Hence, total time taken $=10+10$
$=20$ minutes.